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About an integral univariate problem
2 messages · Freddy Hernandez Barajas, R. Michael Weylandt
How about adding an additional argument to fun? R> fun <- function(x, y) exp(-x)*sum(y^x) R> y <- c(2,3,5) R> integrate(fun, 0, 3, y) [1] 346.853 with absolute error < 3.9e-12 Michael On Tue, Oct 18, 2011 at 10:01 AM, Freddy Hernandez Barajas
<fhernanb at gmail.com> wrote:
Hello all R users I want to calculate this univariate integral: exp(-x)*sum(y^x) ?respect to x ?from 0 to 3 ?where y is a vector y=(2,3,5). In fact, the original y vector has a large number of elements but I propose with 3 elements. I know that I can resolve this problem doing fun <- function(x) exp(-x)*(2^x+3^x+5^x) integrate(fun,0,3) When the y vector has a large number of elements the last solution is not possible, if I use this another way I can not obtain the true answer ? y <- c(2,3,5) fun1 <- function(x) exp(-x)*sum(y^x) integrate(fun1,0,3) Someone could give me a help with the problem? Thanks. Freddy Hern?ndez Barajas ? ? ? ?[[alternative HTML version deleted]]
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